Bolt-tightener.



F. H. PIERCE.

BOLT TIGHTENER.

APPLICATION FILED -JAN.16. 191s.

'Patented Aug. 31, 1915.

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Specification of Letters Patent. PatentedAug. 31, 1915.

Application filed January 16, 1915. Serial No. 2,713.

To all whom it may concern Be it known that I, FRED H. PIERCE, a citizen of the United States, residing at Gordonsville, in the county of Freeborn and State 01' Minnesota, have invented certain new and useful Improvements in Bolt- Tighteners; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to bolt machines or power wrenches for screwing up and for removing the nuts of the tire bolts of vehicle wheels and other bolts; and it consists in the novel construction and combination of the parts hereinafter fully described and claimed.

In the drawings, Figure 1 is a side view of a bolt machine constructed according to this invention. Fig. 2 is a front end view of the same. Fig. 3 is a plan View of the machine.

This machine is adapted to be secured to a drill press or other similar machine tool of any approved construction, which is provided with a pillar 2 or other stationary supporting frame, and a revoluble spindle 3 I having a drill chuck 4 or other similar tool holder.

The bolt machine has a horizontal arm formed of two sections 5 and 6. One section 5 has a socket 7 at one end which is clamped upon the pillar 2 or is otherwise rigidly secured in place. The other section 6 is slidable telescopically on the section 5 and radially of the pillar 2. The slidable section 6 is guided in any convenient way, and it is provided with any suitable clamping device for securing it to the non-slidable section 5 after its position has been adjusted. In the machine shown the slidable section has a slot 8 and a stud or bolt 9 projects through this slot from the non-slidable section and is provided with a clamping nut 10. The slidable arm section 6 has a vertical shaft 12 journaled in its free end portion, and a wrench jaw or socket 14: is formed on or secured to the upper end portion of this shaft. A toothed wheel 15 is secured on the lower end portion of the shaft 12, and it gears into a similar toothed wheel 16 secured onthe lower end portion of a driving shaft 17. A second driving shaft 18 is arranged parallel to the shaft 17, and on the other side of it from the shaft 12, and a toothed wheel 19 is secured on the shaft 18 and gears into the wheel 16. The two shafts 17 and 18 are journaled in hearings in the arm section 6, and in a bracket 20 secured to the said arm section, and the upper end portion of each shaft is adapted to be secured in the drill chuck 4.

A lever 21 is pivoted on a pin 22 in the frontend portion of the bracket 20, and this lever has a slot 24 through which the two shafts 17 and '18 project. A spring 25 is arranged around the rear shaft 18 between the lever and the top of the bracket 20, and operates to normally hold the front end portion of the lever 21 in a raised position. The front end portion of the lever 21 has a knife-edge 26, or other similar device, which engages with the head of the bolt 27. The bolt 27 and a portion ofthe wheel felly 28 are shown in dotted lines in Fig. 1.

The nut to be revolved is placed in engagement with the jaw or socket 14: and the lever is depressed by hand so as to keep the bolt from revolving. One driving shaft is used to screw up nuts, and the other driving shaft is used for unscrewing them. These shafts are placed alternately in engagement with the drill chuck, according to the direction of revolution required. The drill chuck is always revolved in the same direction, and the slidable arm section is moved as required.

What I claim is:

1. An attachment for a power drill or similar machine, comprising a supporting arm formed of sections one of which is provided with a guide in which the other section is slidable longitudinally, means for securing one section to the frame of the machine, a clamping device for securing the two arm sections together, a wrench shaft provided with a wrench jaw for engaging a nut, said shaft being j ournaled in the slidable arm section, two driving shafts also journaled in the slidable arm section and each provided with means for engaging with the tool spindle of the machine, and toothed wheels operatively connecting the three shafts together and permitting the wrench shaft to be revolved in each direction without changing the position or direction of motion of the tool spindle. 1

2. In a bolt machine, the combination, with a supporting arm, and a wrench shaft journaled therein and provided with a wrench jaw, said arm being provided with a I bracket which projects abo ire p g ncircling the rear driving shaft and ing shafts journaled in theosaid, arm and bracket, toothed wheels'opratively connect' ing the. three shafts together, a lever piy oted to the bracket between the two driving shafts and provided atitsfront end with I means for" engagfiig the 5011; head, and a arranged between the rear end of the lever and the shaft bearing oftliebracket aboi ef it and ntrman hold-ingest from end the 'lever'in a raised position. v

31111 a bolt machine, thecornbinatiofi,

- with a supporting armTformed ofcse'ction's,-"

3 section being provided wan a gaiide wliichi his mas longitlidinallgy on a, stationar section and provided with a clamping de- Vice for securing sections together, of

two driving shafts j ournaled parallel to each other inthe said slidable section and each provided with similar means for engaging with the drill spindle of the drill 'pres's, a wrench shaft al's oj-ournaled in the slidable section and provided with a wrench jaw, and toothed wheels oper'atively connecting the three shafts; I V

y In: testimony whereof I have afiixed my signat-iifei'nthe resence oftwo witnesses; FRED H. PIERCE.

Witnesses: I L; Nm'soiw A; D. PLATTL'" Gbpi'eS of thispate nt may' be" obtained for fivwnts each, by address'ingwhe Gonrnfissibner of Patents;

K I o I WasHi'ngton,-D. G.'' 

